Eraser tipped pencil



Nov. I14, 1939. H. zoLL 2,180,132

Patented Nov. 174, 1939 UNITED STATES ArtNr oFFlcs ERASER TIPPED PENCIL Henry Zoll, Elmhurst, N. Y., assignor to Eberhard Faber Pencil Co., Brooklyn, N. Y., a corpora-` tion of New York Application July 25, 1938, 'Serial No. 221,057

2 Claims.

Thisk invention relates generally to the attachment of an eraser to a holder or handle and more particularly the invention contemplates an eraser-tipped pencil. y

A prime object of the invention is to provide a novel and improved combination of a block of erasive material and a holder or handle such as a staff, a wood-sheathed lead pencil or the case of a mechanical pencil, 'whereby the combination can `be economically manufactured and the erasive Vblock shall be rmly attached to the holder.

It has been proposedheretofore to attach a tip of erasive material to a pencil bymolding the tip with ya socket in which the endl of the pencil or a tenon on the pencil is fitted, for example, as shown in UnitedStates patents Reissue No. 1,319, dated June 21, 1862, and No. 38,892, dated June 16, 1863. However, the sockets in the erasive tips have been molded, which is an expensive process and requires 'a separate mold for each different size of socket for different pencils or tenons. Furthermore, Where mass or large quantity production is desired, it is necessary to utilize costly multiple cavity molds. Moreover, the walls of the molded sockets are necessarily smooth and dificulty is encountered in making a secure attachment of the tips to the pencil, even with the use of glue or cement.

Another object of my invention is to provide a combination of the character described wherein the socket in the erasive tip and the portion of the holder or pencil fitted in said socket shall ernbody novel and improved forms and cooperate in a novel and improved manner so that a secure mechanical interlocking or bonding of the Walls of the socket with said portion of the holder shall be provided to firmly attach the tip to the holder.

Other objects, advantages and results of the invention will appear from the following description in conjunction with the accompanying drawing in which Figure 1 is a side elevation of an eraser tipped pencil embodying my invention.

Figure 2 is a composite view showing one end of the pencil in side elevation and an eraser tip in vertical section, in detached relation and on a greatly enlarged scale.

Figure 3 is a similar view showing the erasive tip fitted on the end of the pencil.

Figure 4 is a horizontal sectional View on the line 4-4 of Figure 3,

. Figure 5 is a View similar to Figure 2 showing a modification of the invention.

Figure 6 is a view similar to Figure 3 showing cal pencil. At one end, the stair has a cylindrical reduced portion I which forms a shoulder 2 'between the reduced portion and the main portion of the staff.

Mounted on one end of the staff is an erasive tip 3 which is in the formrof a cylindrical or other suitably shaped block of elastic erasive material such as is commonly used on lead pencils. As shown, one end of the verasive block 3 has a socket i which frictionally receives and fits over a reduced portion I of the stair A with one end of the block 3 abutting the shoulder 2. The tip 3 may be securely held on the reduced portion I by frictional engagement of the elastic erasive material with the surface of the reduced portion,` and if desired, a glue or cement may be applied between the surfaces of the walls of the socket 4 and the surfaces of the portion I.

In accordance with the invention the walls of the socket 4 are linely serrated to provide a secure irictional grip on the reduced portion I of the staif, and also the peripheral surface of the portion l is finely serrated. The serrated surfaces of the walls of the socket 4 are preferably formed by drilling the socket 4 in the block of erasive material 3, while the serrations of the surface of the portion I of the stair may be formed as 'by a wood or metal turning operation.

Due to the elastic properties of the erasive material, the surfaces of the walls of the socket 4 will be irregularly serrated and torn, as distinguished from the smooth walls that are formed by molding sockets in erasive tips.

Similarly, especially when the stair A is of wood or like brous material, the surface of the reduced portion I will be irregularly serrated and torn.

staff is inserted into the socket 4, the serrations of the surfaces of the walls of the sockets and of the surfaces of the portions I will interlock, as shown in Figures 3 and 4, and be held firmly interlocked by the elastic properties of the erasive block 3 so that the erasive block will be firmly mounted on the staff against accidental displacement, but preferably removable therefrom by forcible pulling of the tip longitudinally of the Therefore, when the reduced portion I of the sta to permit interchange or renewal of the erasive tips.

My invention makes it possible to produce the erasiveblock B by an extrusion process so that the erasive material may be extruded in a continuous rod-like form, of any desired cross-sectional shape, then severed into blocks of the desired length, after which the sockets 4 may be drilled in the blocks. This method of producing the erasive blocks overcomes the disadvantages of the old methods of forming erasive tips by molding. The necessity for many different molds for different sizes of sockets 4 to t different sizes of staffs or reduced portions I on the holder, is completely eliminated; any desired diameter of socket 4 may be provided in any block 3 by utilizing a drill of the proper diameter. Accordingly, my invention makes it possible to produce erasive tips of the general character described rapidly and economically.

Obviously, the erasive blocks may be of different sizes and shapes, as desired.

In Figure 5 I have shown the stail of the holder in the form of a ferrule or cap 6 of metal or other suitable material xedly attached to one end of the pencil casing L. The cap 6 has a socketed base portion 'I to fit over the end of the pencil casing and prick-punched or otherwise interlocked with the casing as at 8. From one end of the base portion 1, integrally projects a reduced spindle 9 corresponding to the tenon or reduced portion I, and preferably the surface of this spindle is serrated or knurled to interlock with the serrated walls of the socket 4 of the erasive tip which is frctionally fitted on the spindle.

Figure 6 illustrates the staff of the holder in the form of a point-protecting cap IU removably frictionally fitted over the pointed end M of the pencil N, and also adapted to be interchangeably removably fitted on the other end of the pencil during use of the pointed end in Writing. The cap l0 has a reduced spindle Il similar to the spindle 9 on which the erasive tip 3 is frictionally tted. Here the tip is shown as triangular in shape.

Various modifications and changes in the details of structure of the combined pencil and erasive tip will occur to those skilled in the art as within the scope of the invention.

Having thus described my invention, what I claim is:

1. An article of manufacture comprising a block of elastic erasive material having a cylindrical drilled socket the surfaces of the walls of which have been roughened and torn by the drilling operation, and a staff having a roughened cylindrical surface tightly frctionally fitted into said socket, whereby the block is firmly held on said staff by the interlocking of said roughened surfaces under the influence of the elasticity of said block.

2. As a new article of manufacture, an erasive tip for a pencil comprising an elastic block of erasive material having a drilled socket to frictionally t over the end of a pencil, the surfaces of the walls of said socket being in the irregularly roughened and torn condition resultant of the drilling operation.

HENRY ZOLL. 

